<p>Well i am biased on this subject because i am a biology major but i would recommend taking the 100 level bio, chem, geology, or physics class. My school has an option to take classes as a credit/no credit which does not affect the gpa. You will need to take a science class to fulfill ge requirements.</p>
<p>On a side note: Being a science major is very hard and requires a lot of time and dedication. Are you will to study for 30 hours a week? take multiple science classes at once? Give up weekends/ parties to study?
I would try the 100 levels out if you like it and do well then become a science major.</p>